"It's been fairly low temperatures in the mornings all weekend and that looks set to continue through until Thursday," Mr Ryan said.

The forecast for the city centre on Tuesday morning is a much cooler six degrees overnight and eight degrees on Wednesday morning.

Mr Ryan said the Queen's Birthday holiday would be the pick of the sunnier days this week. More high cloud cover is expected through to mid-week. Showers are expected on Thursday and a chance of showers on Friday.

The coldest morning in the city centre overnight this year was on May 8 when the temperature dropped to 4.3 degrees.